Magnetization reversal dynamics in Au/Co/Au(111) ultrathin films: Effect of roughness of the buffer layer

Compressed exponential form for disordered domain wall motion in ultra-thin Au/Co/Au ferromagnetic films

“…This decrease is in contrast to what is usually observed in Au/Co/Au systems with cobalt thicknesses in the same range as the ones studied here, where coercivity generally increases with decrease in the thickness of the cobalt layer [10,11]. The decrease in the coercivity in our samples is probably due to the effect of the morphology of the gold buffer layer [6]. The coercivity has a nucleation or wall propagation origin, but being also usually correlated with the anisotropy let us discuss of the anisotropy of our samples.…”

“…The rms roughness of the buffer layer is estimated to be 0.316 nm. We showed previously that the average of the slopes on rough surfaces can be obtained in two different ways [6]. This average slope angle (g a ) is estimated to be approximately 91 (g a E91) along the line traced in Fig.…”

“…The details of the deposition technique as well as deposition conditions were mentioned in Ref. [6]. Fig.…”

“…Moreover if there is change of structure from hcp to fcc the magneto-crystalline effects can also decrease thus causing a reduction of anisotropy. The measurement of anisotropy of our layers was made by means of magnetization loops obtained in tilted field [6]. In Table 1 the values of K 1eff and K 2 are given.…”

Asymmetric Pt/Co/Pt-stack induced sign-control of current-induced magnetic domain-wall creep

“…1 schematically illustrated together with two direct consequences of this approach. First, the different bottom Pt thicknesses, grown directly on the substrate, result in a different interface quality with the Co layer, 22,23 schematically illustrated by the different colors at the Pt/Co interface. Second, when a current is passed through such a tri-layer stack a different current density distribution is expected.…”